For each of the following pairs, predict which (A or B) will...

For each of the following pairs, predict which (A or B) will have the greater entropy, and in one sentence indicate your reasoning. | | A | B | |---|---|---| | 1 | 1 mole of HI(g) | 1 mole of HBr(g) | | 2 | 1 mole of HI(g) at 20°C | 1 mole of HI(g) at 30°C | | 3 | 3 moles of H2(g) + 1 mole of N2(g) | 2 moles of NH3(g) | | 4 | 1 mole of H2(g), pressure = 1 atm | 1 mole of H2(g), pressure = 0.1 atm | | 5 | 1 mole of CO2(g) | 1 mole of CO2(aq) | | 6 | 1 mole of HCOOH(l) | 1 mole of HCOOH(aq) |

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0:00 All right.

00:01 So in each case, we have a column a and column b substance, and we want to determine which one of them has the greater entropy.

00:09 So we know that entropy, which is denoted by the letter s, is a measure of the disorder or randomness, the different types of arrangements that you can have of a system.

00:22 So in general, it increases as you go from solid to liquid to gas and as you form more moles of gas.

00:30 Because you have more rapid random motion, more possible micro arrangements and configurations.

00:38 So all right, for part one, we have one mole of h .i gas and one mole of hbr gas.

00:44 So in both cases, we're comparing one mole of gas.

00:54 So the only other thing we could look at is the relative size.

00:57 So h .i contains iodine and hbr contains bromine, and h .i.

01:03 Iodine is heavier, so this is gonna be a heavier molecule.

01:06 Heavier molecules have greater entropy when all the other factors are the same.

01:10 So it's going to be this one.

01:13 All right, for number two, we have the same gas, one mole of the same gas, but at different temperatures.

01:19 At 30 degrees celsius, the higher temperature means that particles will have more kinetic energy.

01:25 They'll move faster, more chaotically, more disorder.

01:27 So that's going to be the higher entropy...

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